如何在React组件中迭代嵌套数组？

Question

我有一个多维数组:一个results包含18个数组的数组row,每个数组包含6个数字.

我想把它渲染成一张桌子.逻辑是

results.each as (row)
     <tr>
         row.each as (number)
               <td>number</td>
     </tr>

但我无法弄清楚你是如何用JSX写的.

const Resultset = props => (
    {props.rows.map(rows => {
        <tr>
            {rows.map(number => <td>{number}</td>)}
        </tr>
    })}
);

但那不对.这是什么程序,如何嵌套地图调用和插值？

Answer 1

一种方法

var arr = [ [ 2, 3, 4, 5, 6, 7 ],
  [ 8, 9, 10, 11, 12, 13 ],
  [ 14, 15, 16, 17, 18, 19 ],
  [ 20, 21, 22, 23, 24, 25 ],
  [ 26, 27, 28, 29, 30, 31 ],
  [ 32, 33, 34, 35, 36, 37 ],
  [ 38, 39, 40, 41, 42, 43 ],
  [ 44, 45, 46, 47, 48, 49 ],
  [ 50, 51, 52, 53, 54, 55 ],
  [ 56, 57, 58, 59, 60, 61 ],
  [ 62, 63, 64, 65, 66, 67 ],
  [ 68, 69, 70, 71, 72, 73 ],
  [ 74, 75, 76, 77, 78, 79 ],
  [ 80, 81, 82, 83, 84, 85 ],
  [ 86, 87, 88, 89, 90, 91 ],
  [ 92, 93, 94, 95, 96, 97 ],
  [ 98, 99, 100, 101, 102, 103 ],
  [ 104, 105, 106, 107, 108, 109 ] ];

var Hello = React.createClass({
  tablerows: function() {
    return this.props.arr.map(rows => {
        var row = rows.map(cell => <td>{cell}</td>); 
        return <tr>{row}</tr>;
    });
  },
  render: function() {
    return <table>{this.tablerows()}</table>;
  }
});

ReactDOM.render(
  <Hello arr={arr} />,
  document.getElementById('container')
);

在行动:https://jsfiddle.net/69z2wepo/30476/

Answer 2

我建议将组件分离为Resultset，NumberComponent并尝试与箭头函数保持一致。

// Explicit return

const NumberComponent = props => {
    return (
        <td>{ props.number }</td>
    )
}

const Resultset = props => {
    return (
        <tr>
            {
                props.rows.map( number => <NumberComponent number={number} />)
            }
        </tr>
    )
}

// Implicit return

const NumberComponent = props => (<td>{ props.number }</td>);

const Resultset = props => (
    <tr>
        {
            props.rows.map( number => <NumberComponent number={number} />)
        }
    </tr>
);